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cubicsuperpath.py

#!/usr/bin/env python
"""
cubicsuperpath.py

Copyright (C) 2005 Aaron Spike, aaron@ekips.org

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""
import simplepath 

def CubicSuperPath(simplepath):
      csp = []
      subpath = -1
      subpathstart = []
      last = []
      lastctrl = []
      for s in simplepath:
            cmd, params = s         
            if cmd == 'M':
                  if last:
                        csp[subpath].append([lastctrl[:],last[:],last[:]])
                  subpath += 1
                  csp.append([])
                  subpathstart =  params[:]
                  last = params[:]
                  lastctrl = params[:]
            elif cmd == 'L':
                  csp[subpath].append([lastctrl[:],last[:],last[:]])
                  last = params[:]
                  lastctrl = params[:]
            elif cmd == 'C':
                  csp[subpath].append([lastctrl[:],last[:],params[:2]])
                  last = params[-2:]
                  lastctrl = params[2:4]
            elif cmd == 'Q':
                  #TODO: convert to cubic
                  csp[subpath].append([lastctrl[:],last[:],last[:]])
                  last = params[-2:]
                  lastctrl = params[-2:]
            elif cmd == 'A':
                  #TODO: convert to cubics
                  csp[subpath].append([lastctrl[:],last[:],last[:]])
                  last = params[-2:]
                  lastctrl = params[-2:]
            elif cmd == 'Z':
                  csp[subpath].append([lastctrl[:],last[:],last[:]])
                  last = subpathstart[:]
                  lastctrl = subpathstart[:]
      #append final superpoint
      csp[subpath].append([lastctrl[:],last[:],last[:]])
      return csp  

def unCubicSuperPath(csp):
      a = []
      for subpath in csp:
            if subpath:
                  a.append(['M',subpath[0][1][:]])
                  for i in range(1,len(subpath)):
                        a.append(['C',subpath[i-1][2][:] + subpath[i][0][:] + subpath[i][1][:]])
      return a

def parsePath(d):
      return CubicSuperPath(simplepath.parsePath(d))

def formatPath(p):
      return simplepath.formatPath(unCubicSuperPath(p))





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